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Message-ID: <20250610-iio-driver-ad4052-v3-4-cf1e44c516d4@analog.com>
Date: Tue, 10 Jun 2025 09:34:37 +0200
From: Jorge Marques <jorge.marques@...log.com>
To: Jonathan Cameron <jic23@...nel.org>, Lars-Peter Clausen <lars@...afoo.de>,
Michael Hennerich <Michael.Hennerich@...log.com>,
Rob Herring
<robh@...nel.org>,
Krzysztof Kozlowski <krzk+dt@...nel.org>,
Conor Dooley
<conor+dt@...nel.org>, Jonathan Corbet <corbet@....net>,
David Lechner
<dlechner@...libre.com>,
Nuno Sá <nuno.sa@...log.com>,
"Andy
Shevchenko" <andy@...nel.org>,
Uwe Kleine-König
<ukleinek@...nel.org>
CC: <linux-iio@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
<devicetree@...r.kernel.org>, <linux-doc@...r.kernel.org>,
<linux-pwm@...r.kernel.org>, Jorge Marques <jorge.marques@...log.com>
Subject: [PATCH v3 4/8] iio: adc: Add support for ad4052
The AD4052/AD4058/AD4050/AD4056 are versatile, 16-bit/12-bit, successive
approximation register (SAR) analog-to-digital converter (ADC) that
enables low-power, high-density data acquisition solutions without
sacrificing precision. This ADC offers a unique balance of performance
and power efficiency, plus innovative features for seamlessly switching
between high-resolution and low-power modes tailored to the immediate
needs of the system. The AD4052/AD4058/AD4050/AD4056 are ideal for
battery-powered, compact data acquisition and edge sensing applications.
Signed-off-by: Jorge Marques <jorge.marques@...log.com>
---
MAINTAINERS | 1 +
drivers/iio/adc/Kconfig | 15 +
drivers/iio/adc/Makefile | 1 +
drivers/iio/adc/ad4052.c | 1083 ++++++++++++++++++++++++++++++++++++++++++++++
4 files changed, 1100 insertions(+)
diff --git a/MAINTAINERS b/MAINTAINERS
index 32afd568b68e45616c291d689a35ab905d421cd1..d83ac902e515575e1419df7505d2e8a96f69244a 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -1343,6 +1343,7 @@ S: Supported
W: https://ez.analog.com/linux-software-drivers
F: Documentation/devicetree/bindings/iio/adc/adi,ad4052.yaml
F: Documentation/iio/ad4052.rst
+F: drivers/iio/adc/ad4052.c
ANALOG DEVICES INC AD4080 DRIVER
M: Antoniu Miclaus <antoniu.miclaus@...log.com>
diff --git a/drivers/iio/adc/Kconfig b/drivers/iio/adc/Kconfig
index 3bd03df9a9761f20e2b1b71b51ebe43ba7f51b60..1fe14f939a4d9473b697b40f022124a2ae0b3245 100644
--- a/drivers/iio/adc/Kconfig
+++ b/drivers/iio/adc/Kconfig
@@ -55,6 +55,21 @@ config AD4030
To compile this driver as a module, choose M here: the module will be
called ad4030.
+config AD4052
+ tristate "Analog Devices AD4052 Driver"
+ depends on SPI
+ depends on GPIOLIB
+ select SPI_OFFLOAD
+ select IIO_BUFFER
+ select IIO_BUFFER_DMAENGINE
+ select REGMAP_SPI
+ help
+ Say yes here to build support for Analog Devices AD4052 SPI analog
+ to digital converters (ADC).
+
+ To compile this driver as a module, choose M here: the module will be
+ called ad4052.
+
config AD4080
tristate "Analog Devices AD4080 high speed ADC"
depends on SPI
diff --git a/drivers/iio/adc/Makefile b/drivers/iio/adc/Makefile
index 6516ccb4d63bcfe2e2d56c39da7b906fdbe62319..dc3cd61df815fe7a7e77fad85630794b8be11f86 100644
--- a/drivers/iio/adc/Makefile
+++ b/drivers/iio/adc/Makefile
@@ -10,6 +10,7 @@ obj-$(CONFIG_AB8500_GPADC) += ab8500-gpadc.o
obj-$(CONFIG_AD_SIGMA_DELTA) += ad_sigma_delta.o
obj-$(CONFIG_AD4000) += ad4000.o
obj-$(CONFIG_AD4030) += ad4030.o
+obj-$(CONFIG_AD4052) += ad4052.o
obj-$(CONFIG_AD4080) += ad4080.o
obj-$(CONFIG_AD4130) += ad4130.o
obj-$(CONFIG_AD4695) += ad4695.o
diff --git a/drivers/iio/adc/ad4052.c b/drivers/iio/adc/ad4052.c
new file mode 100644
index 0000000000000000000000000000000000000000..842f5972a1c58701addf5243e7b87da9c26c773f
--- /dev/null
+++ b/drivers/iio/adc/ad4052.c
@@ -0,0 +1,1083 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Analog Devices AD4052 SPI ADC driver
+ *
+ * Copyright 2025 Analog Devices Inc.
+ */
+#include <linux/array_size.h>
+#include <linux/bitfield.h>
+#include <linux/bitops.h>
+#include <linux/completion.h>
+#include <linux/delay.h>
+#include <linux/err.h>
+#include <linux/gpio/consumer.h>
+#include <linux/iio/iio.h>
+#include <linux/iio/sysfs.h>
+#include <linux/interrupt.h>
+#include <linux/jiffies.h>
+#include <linux/math.h>
+#include <linux/minmax.h>
+#include <linux/pm_runtime.h>
+#include <linux/property.h>
+#include <linux/pwm.h>
+#include <linux/regmap.h>
+#include <linux/regulator/consumer.h>
+#include <linux/spi/spi.h>
+#include <linux/string.h>
+#include <linux/types.h>
+#include <linux/units.h>
+#include <linux/unaligned.h>
+#include <dt-bindings/iio/adc/adi,ad4052.h>
+
+#define AD4052_REG_INTERFACE_CONFIG_A 0x00
+#define AD4052_REG_DEVICE_CONFIG 0x02
+#define AD4052_REG_DEVICE_CONFIG_POWER_MODE_MSK GENMASK(1, 0)
+#define AD4052_REG_DEVICE_CONFIG_LOW_POWER_MODE 3
+#define AD4052_REG_PROD_ID_1 0x05
+#define AD4052_REG_DEVICE_GRADE 0x06
+#define AD4052_REG_SCRATCH_PAD 0x0A
+#define AD4052_REG_VENDOR_H 0x0D
+#define AD4052_REG_STREAM_MODE 0x0E
+#define AD4052_REG_INTERFACE_STATUS 0x11
+#define AD4052_REG_INTERFACE_STATUS_NOT_RDY BIT(7)
+#define AD4052_REG_MODE_SET 0x20
+#define AD4052_REG_MODE_SET_ENTER_ADC BIT(0)
+#define AD4052_REG_ADC_MODES 0x21
+#define AD4052_REG_ADC_MODES_MODE_MSK GENMASK(1, 0)
+#define AD4052_REG_ADC_MODES_DATA_FORMAT BIT(7)
+#define AD4052_REG_ADC_CONFIG 0x22
+#define AD4052_REG_ADC_CONFIG_REF_EN_MSK BIT(5)
+#define AD4052_REG_ADC_CONFIG_SCALE_EN_MSK BIT(4)
+#define AD4052_REG_AVG_CONFIG 0x23
+#define AD4052_REG_GP_CONF 0x24
+#define AD4052_REG_GP_CONF_MODE_MSK_0 GENMASK(2, 0)
+#define AD4052_REG_GP_CONF_MODE_MSK_1 GENMASK(6, 4)
+#define AD4052_REG_INTR_CONF 0x25
+#define AD4052_REG_INTR_CONF_EN_MSK_0 GENMASK(1, 0)
+#define AD4052_REG_INTR_CONF_EN_MSK_1 GENMASK(5, 4)
+#define AD4052_REG_TIMER_CONFIG 0x27
+#define AD4052_REG_TIMER_CONFIG_FS_MASK GENMASK(7, 4)
+#define AD4052_REG_TIMER_CONFIG_300KSPS 0x2
+#define AD4052_REG_MAX_LIMIT 0x29
+#define AD4052_REG_MIN_LIMIT 0x2B
+#define AD4052_REG_MAX_HYST 0x2C
+#define AD4052_REG_MIN_HYST 0x2D
+#define AD4052_REG_MON_VAL 0x2F
+#define AD4052_REG_FUSE_CRC 0x40
+#define AD4052_REG_DEVICE_STATUS 0x41
+#define AD4052_REG_DEVICE_STATUS_DEVICE_RDY BIT(7)
+#define AD4052_REG_DEVICE_STATUS_DEVICE_RESET BIT(6)
+#define AD4052_REG_MIN_SAMPLE 0x45
+#define AD4052_MAX_REG 0x45
+
+#define AD4052_SPI_VENDOR 0x0456
+
+#define AD4050_MAX_AVG 0x7
+#define AD4052_MAX_AVG 0xB
+#define AD4052_MAX_RATE(x) ((x) == AD4052_500KSPS ? 500000 : 2000000)
+#define AD4052_FS_OFFSET(g) ((g) == AD4052_500KSPS ? 2 : 0)
+#define AD4052_FS(g) (&ad4052_conversion_freqs[AD4052_FS_OFFSET(g)])
+#define AD4052_FS_LEN(g) (ARRAY_SIZE(ad4052_conversion_freqs) - (AD4052_FS_OFFSET(g)))
+#define AD4052_MON_VAL_MAX_GAIN 1999970
+#define AD4052_MON_VAL_MIDDLE_POINT 0x8000
+#define AD4052_T_CNVH_NS 10
+#define AD4052_VIO_3V3 3300000
+#define AD4052_SPI_MAX_ADC_XFER_SPEED(x) ((x) >= AD4052_VIO_3V3 ? 83333333 : 58823529)
+#define AD4052_SPI_MAX_REG_XFER_SPEED 16000000
+
+enum ad4052_grade {
+ AD4052_2MSPS,
+ AD4052_500KSPS,
+};
+
+enum ad4052_operation_mode {
+ AD4052_SAMPLE_MODE = 0,
+ AD4052_BURST_AVERAGING_MODE = 1,
+ AD4052_MONITOR_MODE = 3,
+};
+
+enum ad4052_gp_mode {
+ AD4052_GP_DISABLED,
+ AD4052_GP_INTR,
+ AD4052_GP_DRDY,
+};
+
+enum ad4052_interrupt_en {
+ AD4052_INTR_EN_NEITHER,
+ AD4052_INTR_EN_MIN,
+ AD4052_INTR_EN_MAX,
+ AD4052_INTR_EN_EITHER,
+};
+
+struct ad4052_chip_info {
+ const struct iio_chan_spec channels[1];
+ const char *name;
+ u16 prod_id;
+ u8 max_avg;
+ u8 grade;
+};
+
+enum {
+ AD4052_SCAN_TYPE_SAMPLE,
+ AD4052_SCAN_TYPE_BURST_AVG,
+};
+
+static const struct iio_scan_type ad4052_scan_type_12_s[] = {
+ [AD4052_SCAN_TYPE_SAMPLE] = {
+ .sign = 's',
+ .realbits = 16,
+ .storagebits = 32,
+ .endianness = IIO_CPU,
+ },
+ [AD4052_SCAN_TYPE_BURST_AVG] = {
+ .sign = 's',
+ .realbits = 16,
+ .storagebits = 32,
+ .endianness = IIO_CPU,
+ },
+};
+
+static const struct iio_scan_type ad4052_scan_type_16_s[] = {
+ [AD4052_SCAN_TYPE_SAMPLE] = {
+ .sign = 's',
+ .realbits = 16,
+ .storagebits = 32,
+ .endianness = IIO_CPU,
+ },
+ [AD4052_SCAN_TYPE_BURST_AVG] = {
+ .sign = 's',
+ .realbits = 24,
+ .storagebits = 32,
+ .endianness = IIO_CPU,
+ },
+};
+
+struct ad4052_state {
+ const struct ad4052_bus_ops *ops;
+ const struct ad4052_chip_info *chip;
+ enum ad4052_operation_mode mode;
+ struct spi_device *spi;
+ struct pwm_device *cnv_pwm;
+ struct pwm_state pwm_st;
+ struct spi_transfer xfer;
+ struct gpio_desc *cnv_gp;
+ struct completion completion;
+ struct regmap *regmap;
+ u16 oversampling_frequency;
+ int gp1_irq;
+ int vio_uv;
+ int vref_uv;
+ u8 reg_tx[3];
+ u8 reg_rx[3];
+ u8 raw[4] __aligned(IIO_DMA_MINALIGN);
+ u8 buf_reset_pattern[18];
+};
+
+static int ad4052_spi_read(void *context, const void *reg, size_t reg_size,
+ void *val, size_t val_size)
+{
+ int ret;
+ struct ad4052_state *st = context;
+ struct spi_transfer xfer = {
+ .tx_buf = st->reg_tx,
+ .rx_buf = st->reg_rx,
+ .len = reg_size + val_size,
+ .speed_hz = AD4052_SPI_MAX_REG_XFER_SPEED,
+ };
+
+ if (xfer.len > sizeof(st->reg_tx) ||
+ xfer.len > sizeof(st->reg_rx))
+ return -EINVAL;
+
+ memset(st->reg_tx, 0, sizeof(st->reg_tx));
+ memcpy(st->reg_tx, reg, reg_size);
+
+ ret = spi_sync_transfer(st->spi, &xfer, 1);
+ if (ret)
+ return ret;
+
+ memcpy(val, &st->reg_rx[reg_size], val_size);
+
+ return 0;
+}
+
+static int ad4052_spi_write(void *context, const void *data, size_t count)
+{
+ struct ad4052_state *st = context;
+ struct spi_transfer xfer = {
+ .tx_buf = st->reg_tx,
+ .len = count,
+ .speed_hz = AD4052_SPI_MAX_REG_XFER_SPEED,
+ };
+
+ if (count > sizeof(st->reg_tx))
+ return -EINVAL;
+
+ memcpy(st->reg_tx, data, count);
+
+ return spi_sync_transfer(st->spi, &xfer, 1);
+}
+
+/* To limit the configuration mode access speed */
+static const struct regmap_bus ad4052_regmap_bus = {
+ .read = ad4052_spi_read,
+ .write = ad4052_spi_write,
+ .reg_format_endian_default = REGMAP_ENDIAN_BIG,
+};
+
+static const struct regmap_range ad4052_regmap_rd_ranges[] = {
+ regmap_reg_range(AD4052_REG_INTERFACE_CONFIG_A, AD4052_REG_DEVICE_GRADE),
+ regmap_reg_range(AD4052_REG_SCRATCH_PAD, AD4052_REG_INTERFACE_STATUS),
+ regmap_reg_range(AD4052_REG_MODE_SET, AD4052_REG_MON_VAL),
+ regmap_reg_range(AD4052_REG_FUSE_CRC, AD4052_REG_MIN_SAMPLE),
+};
+
+static const struct regmap_access_table ad4052_regmap_rd_table = {
+ .yes_ranges = ad4052_regmap_rd_ranges,
+ .n_yes_ranges = ARRAY_SIZE(ad4052_regmap_rd_ranges),
+};
+
+static const struct regmap_range ad4052_regmap_wr_ranges[] = {
+ regmap_reg_range(AD4052_REG_INTERFACE_CONFIG_A, AD4052_REG_DEVICE_CONFIG),
+ regmap_reg_range(AD4052_REG_SCRATCH_PAD, AD4052_REG_SCRATCH_PAD),
+ regmap_reg_range(AD4052_REG_STREAM_MODE, AD4052_REG_INTERFACE_STATUS),
+ regmap_reg_range(AD4052_REG_MODE_SET, AD4052_REG_MON_VAL),
+ regmap_reg_range(AD4052_REG_FUSE_CRC, AD4052_REG_DEVICE_STATUS),
+};
+
+static const struct regmap_access_table ad4052_regmap_wr_table = {
+ .yes_ranges = ad4052_regmap_wr_ranges,
+ .n_yes_ranges = ARRAY_SIZE(ad4052_regmap_wr_ranges),
+};
+
+static const char *const ad4052_conversion_freqs[] = {
+ "2000000", "1000000", "300000", "100000", /* 0 - 3 */
+ "33300", "10000", "3000", "500", /* 4 - 7 */
+ "333", "250", "200", "166", /* 8 - 11 */
+ "140", "124", "111", /* 12 - 15 */
+};
+
+static int ad4052_conversion_frequency_set(struct ad4052_state *st, u8 val)
+{
+ val += AD4052_FS_OFFSET(st->chip->grade);
+ return regmap_write(st->regmap, AD4052_REG_TIMER_CONFIG,
+ FIELD_PREP(AD4052_REG_TIMER_CONFIG_FS_MASK, val));
+}
+
+static int ad4052_oversampling_frequency_get(struct iio_dev *indio_dev,
+ const struct iio_chan_spec *chan)
+{
+ struct ad4052_state *st = iio_priv(indio_dev);
+
+ return st->oversampling_frequency - AD4052_FS_OFFSET(st->chip->grade);
+}
+
+static int ad4052_oversampling_frequency_set(struct iio_dev *indio_dev,
+ const struct iio_chan_spec *chan,
+ unsigned int val)
+{
+ struct ad4052_state *st = iio_priv(indio_dev);
+
+ val += AD4052_FS_OFFSET(st->chip->grade);
+ st->oversampling_frequency = val;
+
+ return 0;
+}
+
+static const struct iio_enum AD4052_500KSPS_conversion_freq_enum = {
+ .items = AD4052_FS(AD4052_500KSPS),
+ .num_items = AD4052_FS_LEN(AD4052_500KSPS),
+ .set = ad4052_oversampling_frequency_set,
+ .get = ad4052_oversampling_frequency_get,
+};
+
+static const struct iio_enum AD4052_2MSPS_conversion_freq_enum = {
+ .items = AD4052_FS(AD4052_2MSPS),
+ .num_items = AD4052_FS_LEN(AD4052_2MSPS),
+ .set = ad4052_oversampling_frequency_set,
+ .get = ad4052_oversampling_frequency_get,
+};
+
+#define AD4052_EXT_INFO(grade) \
+static struct iio_chan_spec_ext_info grade##_ext_info[] = { \
+ IIO_ENUM("oversampling_frequency", IIO_SHARED_BY_ALL, \
+ &grade##_conversion_freq_enum), \
+ IIO_ENUM_AVAILABLE("oversampling_frequency", IIO_SHARED_BY_ALL, \
+ &grade##_conversion_freq_enum), \
+ { } \
+}
+
+AD4052_EXT_INFO(AD4052_2MSPS);
+AD4052_EXT_INFO(AD4052_500KSPS);
+
+#define AD4052_CHAN(bits, grade) { \
+ .type = IIO_VOLTAGE, \
+ .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_RAW) | \
+ BIT(IIO_CHAN_INFO_SCALE) | \
+ BIT(IIO_CHAN_INFO_CALIBSCALE) | \
+ BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO), \
+ .info_mask_shared_by_type_available = BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO), \
+ .indexed = 1, \
+ .channel = 0, \
+ .has_ext_scan_type = 1, \
+ .ext_scan_type = ad4052_scan_type_##bits##_s, \
+ .num_ext_scan_type = ARRAY_SIZE(ad4052_scan_type_##bits##_s), \
+ .ext_info = grade##_ext_info, \
+}
+
+#define AD4052_OFFLOAD_CHAN(bits, grade) { \
+ .type = IIO_VOLTAGE, \
+ .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_RAW) | \
+ BIT(IIO_CHAN_INFO_SCALE) | \
+ BIT(IIO_CHAN_INFO_CALIBSCALE) | \
+ BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO) | \
+ BIT(IIO_CHAN_INFO_SAMP_FREQ), \
+ .info_mask_shared_by_type_available = BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO), \
+ .indexed = 1, \
+ .channel = 0, \
+ .has_ext_scan_type = 1, \
+ .ext_scan_type = ad4052_scan_type_##bits##_s, \
+ .num_ext_scan_type = ARRAY_SIZE(ad4052_scan_type_##bits##_s), \
+ .ext_info = grade##_ext_info, \
+}
+
+static const struct ad4052_chip_info ad4050_chip_info = {
+ .name = "ad4050",
+ .channels = { AD4052_CHAN(12, AD4052_2MSPS) },
+ .prod_id = 0x70,
+ .max_avg = AD4050_MAX_AVG,
+ .grade = AD4052_2MSPS,
+};
+
+static const struct ad4052_chip_info ad4052_chip_info = {
+ .name = "ad4052",
+ .channels = { AD4052_CHAN(16, AD4052_2MSPS) },
+ .prod_id = 0x72,
+ .max_avg = AD4052_MAX_AVG,
+ .grade = AD4052_2MSPS,
+};
+
+static const struct ad4052_chip_info ad4056_chip_info = {
+ .name = "ad4056",
+ .channels = { AD4052_CHAN(12, AD4052_500KSPS) },
+ .prod_id = 0x76,
+ .max_avg = AD4050_MAX_AVG,
+ .grade = AD4052_500KSPS,
+};
+
+static const struct ad4052_chip_info ad4058_chip_info = {
+ .name = "ad4058",
+ .channels = { AD4052_CHAN(16, AD4052_500KSPS) },
+ .prod_id = 0x78,
+ .max_avg = AD4052_MAX_AVG,
+ .grade = AD4052_500KSPS,
+};
+
+static int ad4052_update_xfer_raw(struct iio_dev *indio_dev,
+ struct iio_chan_spec const *chan)
+{
+ struct ad4052_state *st = iio_priv(indio_dev);
+ const struct iio_scan_type *scan_type;
+ struct spi_transfer *xfer = &st->xfer;
+
+ scan_type = iio_get_current_scan_type(indio_dev, chan);
+ if (IS_ERR(scan_type))
+ return PTR_ERR(scan_type);
+
+ xfer->rx_buf = st->raw;
+ xfer->bits_per_word = scan_type->realbits;
+ xfer->len = scan_type->realbits == 24 ? 4 : 2;
+ xfer->speed_hz = AD4052_SPI_MAX_ADC_XFER_SPEED(st->vio_uv);
+
+ return 0;
+}
+
+static int ad4052_set_oversampling_ratio(struct iio_dev *indio_dev,
+ const struct iio_chan_spec *chan,
+ unsigned int val)
+{
+ struct ad4052_state *st = iio_priv(indio_dev);
+ int ret;
+
+ if (val < 1 || val > BIT(st->chip->max_avg + 1))
+ return -EINVAL;
+
+ /* 1 disables oversampling */
+ if (val == 1) {
+ st->mode = AD4052_SAMPLE_MODE;
+ } else {
+ val = ilog2(val);
+ st->mode = AD4052_BURST_AVERAGING_MODE;
+ ret = regmap_write(st->regmap, AD4052_REG_AVG_CONFIG, val - 1);
+ if (ret)
+ return ret;
+ }
+
+ return ad4052_update_xfer_raw(indio_dev, chan);
+}
+
+static int ad4052_get_oversampling_ratio(struct ad4052_state *st,
+ unsigned int *val)
+{
+ int ret, buf;
+
+ if (st->mode == AD4052_SAMPLE_MODE) {
+ *val = 1;
+ return 0;
+ }
+
+ ret = regmap_read(st->regmap, AD4052_REG_AVG_CONFIG, &buf);
+ if (ret)
+ return ret;
+
+ *val = BIT(buf + 1);
+
+ return 0;
+}
+
+static int ad4052_check_ids(struct ad4052_state *st)
+{
+ int ret;
+ u16 val;
+
+ ret = regmap_bulk_read(st->regmap, AD4052_REG_PROD_ID_1, &st->raw, 2);
+ if (ret)
+ return ret;
+
+ val = get_unaligned_be16(st->raw);
+ if (val != st->chip->prod_id)
+ dev_warn(&st->spi->dev,
+ "Production ID x%x does not match known values", val);
+
+ ret = regmap_bulk_read(st->regmap, AD4052_REG_VENDOR_H, &st->raw, 2);
+ if (ret)
+ return ret;
+
+ val = get_unaligned_be16(st->raw);
+ if (val != AD4052_SPI_VENDOR)
+ return -ENODEV;
+
+ return 0;
+}
+
+static int ad4052_exit_command(struct ad4052_state *st)
+{
+ struct spi_device *spi = st->spi;
+ const u8 val = 0xA8;
+
+ return spi_write(spi, &val, 1);
+}
+
+static int ad4052_set_operation_mode(struct ad4052_state *st,
+ enum ad4052_operation_mode mode)
+{
+ int ret;
+
+ if (mode == AD4052_BURST_AVERAGING_MODE) {
+ ret = ad4052_conversion_frequency_set(st, st->oversampling_frequency);
+ if (ret)
+ return ret;
+ }
+
+ ret = regmap_update_bits(st->regmap, AD4052_REG_ADC_MODES,
+ AD4052_REG_ADC_MODES_MODE_MSK, mode);
+ if (ret)
+ return ret;
+
+ return regmap_write(st->regmap, AD4052_REG_MODE_SET,
+ AD4052_REG_MODE_SET_ENTER_ADC);
+}
+
+static int ad4052_set_sampling_freq(struct ad4052_state *st, unsigned int freq)
+{
+ const u32 start = 1;
+
+ if (!in_range(freq, start, AD4052_MAX_RATE(st->chip->grade)))
+ return -EINVAL;
+
+ st->pwm_st.period = DIV_ROUND_UP_ULL(NSEC_PER_SEC, freq);
+ return pwm_apply_might_sleep(st->cnv_pwm, &st->pwm_st);
+}
+
+static int ad4052_soft_reset(struct ad4052_state *st)
+{
+ int ret;
+
+ memset(st->buf_reset_pattern, 0xFF, sizeof(st->buf_reset_pattern));
+ st->buf_reset_pattern[5] = 0xFE;
+ st->buf_reset_pattern[11] = 0xFE;
+ st->buf_reset_pattern[17] = 0xFE;
+
+ ret = spi_write(st->spi, st->buf_reset_pattern,
+ sizeof(st->buf_reset_pattern));
+ if (ret)
+ return ret;
+
+ /* Wait AD4052 reset delay */
+ fsleep(5000);
+
+ return 0;
+}
+
+static int ad4052_setup(struct iio_dev *indio_dev, struct iio_chan_spec const *chan,
+ const bool *ref_sel)
+{
+ struct ad4052_state *st = iio_priv(indio_dev);
+ const struct iio_scan_type *scan_type;
+ int ret;
+
+ scan_type = iio_get_current_scan_type(indio_dev, chan);
+ if (IS_ERR(scan_type))
+ return PTR_ERR(scan_type);
+
+ u8 val = FIELD_PREP(AD4052_REG_GP_CONF_MODE_MSK_0, AD4052_GP_INTR) |
+ FIELD_PREP(AD4052_REG_GP_CONF_MODE_MSK_1, AD4052_GP_DRDY);
+
+ ret = regmap_update_bits(st->regmap, AD4052_REG_GP_CONF,
+ AD4052_REG_GP_CONF_MODE_MSK_1 | AD4052_REG_GP_CONF_MODE_MSK_0,
+ val);
+ if (ret)
+ return ret;
+
+ val = FIELD_PREP(AD4052_REG_INTR_CONF_EN_MSK_0, (AD4052_INTR_EN_EITHER)) |
+ FIELD_PREP(AD4052_REG_INTR_CONF_EN_MSK_1, (AD4052_INTR_EN_NEITHER));
+
+ if (st->chip->grade == AD4052_500KSPS) {
+ ret = regmap_write(st->regmap, AD4052_REG_TIMER_CONFIG,
+ FIELD_PREP(AD4052_REG_TIMER_CONFIG_FS_MASK,
+ AD4052_REG_TIMER_CONFIG_300KSPS));
+ if (ret)
+ return ret;
+ }
+
+ ret = regmap_update_bits(st->regmap, AD4052_REG_ADC_MODES,
+ AD4052_REG_ADC_CONFIG_REF_EN_MSK,
+ FIELD_PREP(AD4052_REG_ADC_CONFIG_REF_EN_MSK,
+ *ref_sel));
+ if (ret)
+ return ret;
+
+ ret = regmap_write(st->regmap, AD4052_REG_DEVICE_STATUS,
+ AD4052_REG_DEVICE_STATUS_DEVICE_RESET);
+ if (ret)
+ return ret;
+
+ return regmap_update_bits(st->regmap, AD4052_REG_INTR_CONF,
+ AD4052_REG_INTR_CONF_EN_MSK_0 | AD4052_REG_INTR_CONF_EN_MSK_1,
+ val);
+}
+
+static irqreturn_t ad4052_irq_handler_drdy(int irq, void *private)
+{
+ struct ad4052_state *st = private;
+
+ complete(&st->completion);
+ return IRQ_HANDLED;
+}
+
+static int ad4052_request_irq(struct iio_dev *indio_dev)
+{
+ struct ad4052_state *st = iio_priv(indio_dev);
+ struct device *dev = &st->spi->dev;
+ int ret;
+
+ ret = fwnode_irq_get_byname(dev_fwnode(&st->spi->dev), "gp1");
+ if (ret > 0) {
+ ret = devm_request_threaded_irq(dev, ret, NULL,
+ ad4052_irq_handler_drdy,
+ IRQF_ONESHOT, indio_dev->name,
+ st);
+ st->gp1_irq = ret;
+ } else if (ret == -EPROBE_DEFER) {
+ return ret;
+ }
+ return 0;
+}
+
+static const int ad4052_oversampling_avail[] = {
+ 1, 2, 4, 8, 16, 32, 64, 128, 256, 512, 1024, 2048, 4096,
+};
+
+static int ad4052_read_avail(struct iio_dev *indio_dev,
+ struct iio_chan_spec const *chan, const int **vals,
+ int *type, int *len, long mask)
+{
+ switch (mask) {
+ case IIO_CHAN_INFO_OVERSAMPLING_RATIO:
+ *vals = ad4052_oversampling_avail;
+ *len = ARRAY_SIZE(ad4052_oversampling_avail);
+ *type = IIO_VAL_INT;
+
+ return IIO_AVAIL_LIST;
+ default:
+ return -EINVAL;
+ }
+}
+
+static int ad4052_get_samp_freq(struct iio_dev *indio_dev,
+ struct iio_chan_spec const *chan,
+ int *val,
+ int *val2)
+{
+ struct ad4052_state *st = iio_priv(indio_dev);
+
+ *val = DIV_ROUND_UP_ULL(NSEC_PER_SEC, st->pwm_st.period);
+ return IIO_VAL_INT;
+}
+
+static int ad4052_get_chan_scale(struct iio_dev *indio_dev,
+ struct iio_chan_spec const *chan,
+ int *val,
+ int *val2)
+{
+ struct ad4052_state *st = iio_priv(indio_dev);
+ const struct iio_scan_type *scan_type;
+
+ scan_type = iio_get_current_scan_type(indio_dev, st->chip->channels);
+ if (IS_ERR(scan_type))
+ return PTR_ERR(scan_type);
+
+ *val = (st->vref_uv * 2) / MILLI;
+
+ *val2 = scan_type->realbits;
+
+ return IIO_VAL_FRACTIONAL_LOG2;
+}
+
+static int ad4052_get_chan_calibscale(struct iio_dev *indio_dev,
+ struct iio_chan_spec const *chan,
+ int *val,
+ int *val2)
+{
+ struct ad4052_state *st = iio_priv(indio_dev);
+ u16 gain;
+ int ret;
+
+ ret = regmap_bulk_read(st->regmap, AD4052_REG_MON_VAL, &st->raw, 2);
+ if (ret)
+ return ret;
+
+ gain = get_unaligned_be16(&st->raw);
+
+ /* From datasheet: code out = code in × mon_val/0x8000 */
+ *val = gain / AD4052_MON_VAL_MIDDLE_POINT;
+ *val2 = mul_u64_u32_div(gain % AD4052_MON_VAL_MIDDLE_POINT, NANO,
+ AD4052_MON_VAL_MIDDLE_POINT);
+
+ return IIO_VAL_INT_PLUS_NANO;
+}
+
+static int ad4052_set_chan_calibscale(struct iio_dev *indio_dev,
+ struct iio_chan_spec const *chan,
+ int gain_int,
+ int gain_frac)
+{
+ struct ad4052_state *st = iio_priv(indio_dev);
+ u64 gain;
+ int ret;
+
+ if (gain_int < 0 || gain_frac < 0)
+ return -EINVAL;
+
+ gain = mul_u32_u32(gain_int, MICRO) + gain_frac;
+
+ if (gain > AD4052_MON_VAL_MAX_GAIN)
+ return -EINVAL;
+
+ put_unaligned_be16(DIV_ROUND_CLOSEST_ULL(gain * AD4052_MON_VAL_MIDDLE_POINT,
+ MICRO),
+ &st->raw);
+
+ ret = regmap_bulk_write(st->regmap, AD4052_REG_MON_VAL, &st->raw, 2);
+ if (ret)
+ return ret;
+
+ return regmap_update_bits(st->regmap, AD4052_REG_ADC_MODES,
+ AD4052_REG_ADC_CONFIG_SCALE_EN_MSK,
+ FIELD_PREP(AD4052_REG_ADC_CONFIG_SCALE_EN_MSK,
+ !(gain_int == 1 && gain_frac == 0)));
+}
+
+static int __ad4052_read_chan_raw(struct ad4052_state *st, int *val)
+{
+ struct spi_device *spi = st->spi;
+ struct spi_transfer t_cnv = {};
+ int ret;
+
+ reinit_completion(&st->completion);
+
+ if (st->cnv_gp) {
+ gpiod_set_value_cansleep(st->cnv_gp, 1);
+ gpiod_set_value_cansleep(st->cnv_gp, 0);
+ } else {
+ ret = spi_sync_transfer(spi, &t_cnv, 1);
+ if (ret)
+ return ret;
+ }
+ /*
+ * Single sample read should be used only for oversampling and
+ * sampling frequency pairs that take less than 1 sec.
+ */
+ if (st->gp1_irq) {
+ ret = wait_for_completion_timeout(&st->completion,
+ msecs_to_jiffies(1000));
+ if (!ret)
+ return -ETIMEDOUT;
+ }
+
+ ret = spi_sync_transfer(spi, &st->xfer, 1);
+ if (ret)
+ return ret;
+
+ if (st->xfer.len == 2)
+ *val = sign_extend32(*(u16 *)(st->raw), 15);
+ else
+ *val = sign_extend32(*(u32 *)(st->raw), 23);
+
+ return ret;
+}
+
+static int ad4052_read_chan_raw(struct iio_dev *indio_dev, int *val)
+{
+ struct ad4052_state *st = iio_priv(indio_dev);
+ int ret;
+
+ ret = pm_runtime_resume_and_get(&st->spi->dev);
+ if (ret)
+ return ret;
+
+ ret = ad4052_set_operation_mode(st, st->mode);
+ if (ret)
+ goto out_error;
+
+ ret = __ad4052_read_chan_raw(st, val);
+ if (ret)
+ goto out_error;
+
+ ret = ad4052_exit_command(st);
+
+out_error:
+ pm_runtime_mark_last_busy(&st->spi->dev);
+ pm_runtime_put_autosuspend(&st->spi->dev);
+ return ret;
+}
+
+static int ad4052_read_raw_dispatch(struct iio_dev *indio_dev,
+ struct iio_chan_spec const *chan, int *val,
+ int *val2, long info)
+{
+ struct ad4052_state *st = iio_priv(indio_dev);
+
+ switch (info) {
+ case IIO_CHAN_INFO_RAW:
+ return ad4052_read_chan_raw(indio_dev, val);
+
+ case IIO_CHAN_INFO_CALIBSCALE:
+ return ad4052_get_chan_calibscale(indio_dev, chan, val, val2);
+
+ case IIO_CHAN_INFO_OVERSAMPLING_RATIO:
+ return ad4052_get_oversampling_ratio(st, val);
+
+ default:
+ return -EINVAL;
+ }
+}
+
+static int ad4052_read_raw(struct iio_dev *indio_dev,
+ struct iio_chan_spec const *chan, int *val,
+ int *val2, long info)
+{
+ int ret;
+
+ if (info == IIO_CHAN_INFO_SAMP_FREQ)
+ return ad4052_get_samp_freq(indio_dev, chan, val, val2);
+ else if (info == IIO_CHAN_INFO_SCALE)
+ return ad4052_get_chan_scale(indio_dev, chan, val, val2);
+
+ if (!iio_device_claim_direct(indio_dev))
+ return -EBUSY;
+
+ ret = ad4052_read_raw_dispatch(indio_dev, chan, val, val2, info);
+ iio_device_release_direct(indio_dev);
+ return ret ? ret : IIO_VAL_INT;
+}
+
+static int ad4052_write_raw_dispatch(struct iio_dev *indio_dev,
+ struct iio_chan_spec const *chan, int val,
+ int val2, long info)
+{
+ switch (info) {
+ case IIO_CHAN_INFO_OVERSAMPLING_RATIO:
+ return ad4052_set_oversampling_ratio(indio_dev, chan, val);
+
+ case IIO_CHAN_INFO_CALIBSCALE:
+ return ad4052_set_chan_calibscale(indio_dev, chan, val, val2);
+
+ default:
+ return -EINVAL;
+ }
+};
+
+static int ad4052_write_raw(struct iio_dev *indio_dev,
+ struct iio_chan_spec const *chan, int val,
+ int val2, long info)
+{
+ struct ad4052_state *st = iio_priv(indio_dev);
+ int ret;
+
+ switch (info) {
+ case IIO_CHAN_INFO_SAMP_FREQ:
+ return ad4052_set_sampling_freq(st, val);
+ }
+
+ if (!iio_device_claim_direct(indio_dev))
+ return -EBUSY;
+
+ ret = ad4052_write_raw_dispatch(indio_dev, chan, val, val2, info);
+ iio_device_release_direct(indio_dev);
+ return ret;
+}
+
+static int ad4052_debugfs_reg_access(struct iio_dev *indio_dev, unsigned int reg,
+ unsigned int writeval, unsigned int *readval)
+{
+ struct ad4052_state *st = iio_priv(indio_dev);
+ int ret;
+
+ if (!iio_device_claim_direct(indio_dev))
+ return -EBUSY;
+
+ if (readval)
+ ret = regmap_read(st->regmap, reg, readval);
+ else
+ ret = regmap_write(st->regmap, reg, writeval);
+ iio_device_release_direct(indio_dev);
+ return ret;
+}
+
+static int ad4052_get_current_scan_type(const struct iio_dev *indio_dev,
+ const struct iio_chan_spec *chan)
+{
+ struct ad4052_state *st = iio_priv(indio_dev);
+
+ return st->mode == AD4052_BURST_AVERAGING_MODE ?
+ AD4052_SCAN_TYPE_BURST_AVG :
+ AD4052_SCAN_TYPE_SAMPLE;
+}
+
+static const struct iio_info ad4052_info = {
+ .read_raw = ad4052_read_raw,
+ .write_raw = ad4052_write_raw,
+ .read_avail = ad4052_read_avail,
+ .get_current_scan_type = &ad4052_get_current_scan_type,
+ .debugfs_reg_access = &ad4052_debugfs_reg_access,
+};
+
+static const struct regmap_config ad4052_regmap_config = {
+ .name = "ad4052",
+ .reg_bits = 8,
+ .val_bits = 8,
+ .max_register = AD4052_MAX_REG,
+ .rd_table = &ad4052_regmap_rd_table,
+ .wr_table = &ad4052_regmap_wr_table,
+ .read_flag_mask = BIT(7),
+ .can_sleep = true,
+};
+
+static int __ad4052_validate_trigger_sources(struct of_phandle_args *trigger_sources)
+{
+ switch (trigger_sources->args[1]) {
+ case AD4052_TRIGGER_PIN_GP1:
+ return trigger_sources->args[0] == AD4052_TRIGGER_EVENT_DATA_READY ?
+ 0 : -EINVAL;
+ default:
+ return -EINVAL;
+ }
+}
+
+static int ad4052_validate_trigger_sources(struct iio_dev *indio_dev)
+{
+ struct ad4052_state *st = iio_priv(indio_dev);
+ struct of_phandle_args trigger_sources;
+ struct device_node *np;
+ int ret;
+
+ np = st->spi->dev.of_node;
+ ret = of_parse_phandle_with_args(np, "trigger-sources",
+ "#trigger-source-cells", 0,
+ &trigger_sources);
+ if (ret)
+ return ret;
+
+ ret = __ad4052_validate_trigger_sources(&trigger_sources);
+ of_node_put(trigger_sources.np);
+ return ret;
+}
+
+static int ad4052_regulators_get(struct ad4052_state *st, bool *ref_sel)
+{
+ struct device *dev = &st->spi->dev;
+ int uv;
+
+ st->vio_uv = devm_regulator_get_enable_read_voltage(dev, "vio");
+ if (st->vio_uv < 0)
+ return dev_err_probe(dev, st->vio_uv,
+ "Failed to enable and read vio voltage\n");
+
+ uv = devm_regulator_get_enable_read_voltage(dev, "vdd");
+ if (uv < 0)
+ return dev_err_probe(dev, uv,
+ "Failed to enable vdd regulator\n");
+
+ st->vref_uv = devm_regulator_get_enable_read_voltage(dev, "ref");
+ *ref_sel = st->vref_uv == -ENODEV;
+ if (st->vref_uv == -ENODEV)
+ st->vref_uv = uv;
+ else if (st->vref_uv < 0)
+ return dev_err_probe(dev, st->vref_uv,
+ "Failed to enable and read ref voltage\n");
+ return 0;
+}
+
+static int ad4052_probe(struct spi_device *spi)
+{
+ const struct ad4052_chip_info *chip;
+ struct device *dev = &spi->dev;
+ struct iio_dev *indio_dev;
+ struct ad4052_state *st;
+ bool ref_sel;
+ int ret;
+
+ chip = spi_get_device_match_data(spi);
+ if (!chip)
+ return dev_err_probe(dev, -ENODEV,
+ "Could not find chip info data\n");
+
+ indio_dev = devm_iio_device_alloc(dev, sizeof(*st));
+ if (!indio_dev)
+ return -ENOMEM;
+
+ st = iio_priv(indio_dev);
+ st->spi = spi;
+ spi_set_drvdata(spi, st);
+ init_completion(&st->completion);
+
+ ret = ad4052_regulators_get(st, &ref_sel);
+ if (ret)
+ return ret;
+
+ st->regmap = devm_regmap_init(dev, &ad4052_regmap_bus, st,
+ &ad4052_regmap_config);
+ if (IS_ERR(st->regmap))
+ return dev_err_probe(dev, PTR_ERR(st->regmap),
+ "Failed to initialize regmap\n");
+
+ st->mode = AD4052_SAMPLE_MODE;
+ st->chip = chip;
+ st->oversampling_frequency = AD4052_FS_OFFSET(st->chip->grade);
+
+ st->cnv_gp = devm_gpiod_get_optional(dev, "cnv", GPIOD_OUT_LOW);
+ if (IS_ERR(st->cnv_gp))
+ return dev_err_probe(dev, PTR_ERR(st->cnv_gp),
+ "Failed to get cnv gpio\n");
+
+ indio_dev->modes = INDIO_DIRECT_MODE;
+ indio_dev->num_channels = 1;
+ indio_dev->info = &ad4052_info;
+ indio_dev->name = chip->name;
+
+ ret = ad4052_validate_trigger_sources(indio_dev);
+ if (ret)
+ return dev_err_probe(dev, ret,
+ "Failed to validate trigger sources\n");
+
+ ret = ad4052_soft_reset(st);
+ if (ret)
+ return dev_err_probe(dev, ret, "AD4052 failed to soft reset\n");
+
+ ret = ad4052_check_ids(st);
+ if (ret)
+ return dev_err_probe(dev, ret,
+ "AD4052 fields assertions failed\n");
+
+ ret = ad4052_setup(indio_dev, indio_dev->channels, &ref_sel);
+ if (ret)
+ return ret;
+
+ ret = ad4052_request_irq(indio_dev);
+ if (ret)
+ return ret;
+
+ ret = ad4052_update_xfer_raw(indio_dev, indio_dev->channels);
+ if (ret)
+ return ret;
+
+ pm_runtime_set_active(dev);
+ ret = devm_pm_runtime_enable(dev);
+ if (ret)
+ return dev_err_probe(dev, ret,
+ "Failed to enable pm_runtime\n");
+
+ pm_runtime_set_autosuspend_delay(dev, 1000);
+ pm_runtime_use_autosuspend(dev);
+
+ return devm_iio_device_register(dev, indio_dev);
+}
+
+static int ad4052_runtime_suspend(struct device *dev)
+{
+ struct ad4052_state *st = dev_get_drvdata(dev);
+
+ return regmap_write(st->regmap, AD4052_REG_DEVICE_CONFIG,
+ FIELD_PREP(AD4052_REG_DEVICE_CONFIG_POWER_MODE_MSK,
+ AD4052_REG_DEVICE_CONFIG_LOW_POWER_MODE));
+}
+
+static int ad4052_runtime_resume(struct device *dev)
+{
+ struct ad4052_state *st = dev_get_drvdata(dev);
+ int ret;
+
+ ret = regmap_clear_bits(st->regmap, AD4052_REG_DEVICE_CONFIG,
+ AD4052_REG_DEVICE_CONFIG_POWER_MODE_MSK);
+
+ fsleep(4000);
+ return ret;
+}
+
+static DEFINE_RUNTIME_DEV_PM_OPS(ad4052_pm_ops, ad4052_runtime_suspend,
+ ad4052_runtime_resume, NULL);
+
+static const struct spi_device_id ad4052_id_table[] = {
+ {"ad4050", (kernel_ulong_t)&ad4050_chip_info },
+ {"ad4052", (kernel_ulong_t)&ad4052_chip_info },
+ {"ad4056", (kernel_ulong_t)&ad4056_chip_info },
+ {"ad4058", (kernel_ulong_t)&ad4058_chip_info },
+ { }
+};
+MODULE_DEVICE_TABLE(spi, ad4052_id_table);
+
+static const struct of_device_id ad4052_of_match[] = {
+ { .compatible = "adi,ad4050", .data = &ad4050_chip_info },
+ { .compatible = "adi,ad4052", .data = &ad4052_chip_info },
+ { .compatible = "adi,ad4056", .data = &ad4056_chip_info },
+ { .compatible = "adi,ad4058", .data = &ad4058_chip_info },
+ { }
+};
+MODULE_DEVICE_TABLE(of, ad4052_of_match);
+
+static struct spi_driver ad4052_driver = {
+ .driver = {
+ .name = "ad4052",
+ .of_match_table = ad4052_of_match,
+ .pm = pm_ptr(&ad4052_pm_ops),
+ },
+ .probe = ad4052_probe,
+ .id_table = ad4052_id_table,
+};
+module_spi_driver(ad4052_driver);
+
+MODULE_AUTHOR("Jorge Marques <jorge.marques@...log.com>");
+MODULE_DESCRIPTION("Analog Devices AD4052");
+MODULE_LICENSE("GPL");
+MODULE_IMPORT_NS("IIO_DMAENGINE_BUFFER");
--
2.49.0
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